Improvement in fire-boxes of steam-generators



UNTTTD STATES PATENT @Tercero CHARLES F. JAIIRIE'I, OF AURORA, ASSIGNOIt TO HIMSELF AND I. AMBLER, OF CHICAGO, ILLINOIS.

IMPROVEMENT IN FIRE-BOXES OF STEAM-GENERATORS.

Specification forming part of Letters Patent No. 52,9L5, (lated February 27, 1866.

To all whom 'at may concern:

Be it knownthat I, C. F. JAURIET, of Aurora, inthe county ot' Kane and State ot' Illinois, have invented a new and useful Improvement in the Construction of Fire-Boxes with a -Water-Bridge for Coal-Burning Engines; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawings, forming part ot' this specification, in which- Figure l is a vertical longitudinal section of the tire-box and a portion of the ue end of a coal-burnin g engine. Fig. 2 is a vertical transverse section ofthe samein the linewxof Fig. 1. Fig. 3 is a section' of the tire-box with water-bridge in the line y y of Fig. 1. Fig. 4 is a perspective view ot' the tire-box with Waterbridge as it appears detached, or when not in- Aclosed by the outerjacket of the engine. Fig.

5 is a sectional perspective view ot'iire-box with water-bridge as it appears when inclosed by the outer jacket, said outer jacket also being shown as broken' away and in section.

Similar letters of reference in the several gures indicate corresponding parts.

The nature of my invention consists in an improved construction of tire-boxes with Water-bridges, whereby every part of the bridge of the lire-box is exposed to the circulating water, and thus an equable distribution ot heat maintained over the. whole surface of the bridge, and also whereby an uninterrupted circulating ot' the Water through the chamber of the bridge, both atthe back end and at both sides of the bridge, is secured, and thus the even temperature of the bridge at all points maintained, and much of the liability of explosions from imperfect circulation overcome, and whereby, also, all the known advantages resulting from the use of a partition or water-bridge in the Eire-box of an engine are obtained without many of Vthe inconveniences and without any additional outlay of money.

To enableothers skilled in the art to make and use my invention, I will proceed to describe its construction and operation.

My water-bridge is limited in its application to a location in that part of the iire-box in which the iirst ignition or burning of the fuel takes place, and in arrangement its rear terminus is below the tlues of the boiler, while its front end is about as high as the top ofthe feed-door of the tire-box, but some distance in rear of said door, as represented. This location and arrangement is not peculiar to my fire-box, as the same has long been adopted.

In the drawings, A represents the iire-box or furnace; B, the boiler or jacket to the tirel box and to the lues or tubes C C. Djis the Water-bridge; E, the door through which the fuel is introduced; F, the peep-hole77 through which the engineer inspects the internal condition of the Hue-sheet G or any other part of the fire-box. H H designate what are usually termed the water-legs77 of the boiler.

I I are a series ot' tubular bolts passing through the inner and outer walls, for the purpose ot' supplying air to the fire-box and thus promoting combustion ot' the fuel.

J are the ordinary;crown-barsfwhich, by means of stay-bolts, as shown, support the crown-sheet ot' the ire-box.

I make my water-bridge D by taking a dat sheet of copper or other suitable metal and lbending it into the fornifofv a semi-tube,'the

upper and lower sides of said semi-tube being iiattened, so as to be on straight lines from the points where they leave the curved or rounded part d ot the sheet which was bent.

The form which I have'attempted'to describeV is clearly shown in Figs. 1, 4, and 5 ofthe drawings. The at shectj thus bent has its front ends and its side edges turned out at right angles, so asto form bolting-langes b I), as shown. Ithus have a bridge which is fully open at its rear terminus and at both of its sides, said opening extending to the front closed end ot' the bridge and entirely across the sheet, as represented. To stay this bridge vertically I introduce through the upper and lower portions of the bridge small screw-bolts c c, said bolts being tapped in the sheet of which the bridge is formed.

To apply the bridge to the interior of the fire-box A, I cut out of each of the side Walls of the tire-box a piece of metal corresponding exactly in form and size with a vertical longitudinal section of the bridge, as represented at cl', Fig. 4. This done, then-bridge is set in its place, which is in line with the passages d d', Figs. 2 and 4, and securely bolted by its ,fw/f flanges or ianches b b to the inner side of the side and back walls of the fire-box. The bridge is also bolted at its upper rear end to the fluesheet, as represented. v

In order to tie the outer or jacket walls together, through-bolts I I are passed from one side to another, as represented, the full opening which mymode of constructing and applying the water-bridge affords admitting of this being done'without passing the bolts through that part of the lire-box where the llame circulates.

The tubular bolts I I serve to stay the lireboX and outer jacket with respect to one another, as will be evident from the drawings, while they serve the other function heretofore ascribed to them. y

From an inspection of the drawings, in connection with the foregoing description, it will be seen that I have obtained an unobstructed communication between the chamber of the lines and the water-bridge, and also between the back and side legs of the boiler,.which communications are all equal in size; that I also dispense entirely with boxes or partitions up through the bridge. In a word, every part of my bridge is of uniform thickness and uniformly exposed to the circulating water, and consequently an equable heating thereof is secured and unequal expansion and contrac-V tion prevented.

The leading object I have in view is to render perfectly practicable the use of a water-A bridge in the fire-box of a coal-burnin g engine, and at the same time render the inode of lnanufacture of 'the re-box with such a bridge as little objectionable as possible to those who are to adopt it.

The great importance of a water-bridge in a fire-box is well understood at the present time, but it may be proper to make the following statement here: Vhen the tire-box is made without a water-bridge or a partition to arrest the llame temporarily in its passage toward the lines, as well as molity the influence of the draft, the exhaust-steam creates a draft so very powerful that it will tear up thefuel or coal and draw the smaller particlesinto and through the lines, depositing them at the front end of the boiler, at the same time injuring the joints of theflues and line-sheet so as to produce leak-- age, and drawing' the heat directly to the lines diagonally across the box, thereby producing very little effect upon the'crown-sheet, whose to be equably acted upon by the heat at all* points, and thus not-be unduly expanded at one point or contracted at another during the various changes in temperature which it is subjected to while being usedand when the-fires are slackcned or allowed to go out. With a vproper]y-constructcd water-bridge a large ex tra heating-surface is secured, and at the same time such a bridge serves as a detlector or rcverberator, it deiiecting the heat and fire forward and upward, thereby throwing it upon or against thec rownsheet, whose entire. heating capacity is thereby made available. In addition to this it also elfectually prevents the coal from being drawn violently against the liuc-sheet and through the tlues, as hereinbefore mentioned, and retains the gas from the coal in the tire-box long enough to be thoroughly consumed before passing into the lines,

My invention is equally applicable-to stationary engines, locomotive-engines, and all engines in which coal is used as fuel.

What I claim as my invention, and desire to secure by Letters Patent, isfl. The water-bridge which is arranged as specified, and is formed of a flat sheet of metal bent into the form of a semi-tube, with dat surfaces at top and bottom, and applied to a lire-box which has those portions ot' its side and back walls included within the area of the semi-tube entirely cut away, so that there is a perfectly free passage for the water in at the back and out at the sides ot' the bridge, substantially in the manner and for the purpose described.

2. The combination of the stay-bolts with the semi-tube water-bridge, substantially as and for the purpose described.

3. The combination of the through staybolts, semi-tube water-bridge, and the outer jacket ofthe fire-box, substantially as andfor the purpose described., j

C. F. JAURIET.

Witnesses:

M. FELSENHELD, E. T. PRINDLE. 

